Storage capacity forecasting by capability sets

ABSTRACT

Methods, computing systems and computer program products implement embodiments of the present invention that include defining multiple capabilities for a set of resources, the resources comprising storage space. A plurality of services are defined, each of the services including one or more of the capabilities for a subset of the resources, and a software defined storage (SDS) system is configured including the defined services. Upon the SDS system receiving a request to forecast an amount of the storage space including one or more of the capabilities that will be available at a specified future time, one or more of the services including the one or more capabilities are identified, and a predicted amount of the storage space for the identified one or more services is computed for specified future time. In some embodiments, a given identified given service includes one or more additional capabilities not required by the request.

FIELD OF THE INVENTION

The present invention relates generally to storage capacity forecasting,and specifically to a processing storage capacity forecast request in asoftware-defined storage system.

BACKGROUND

In a software-defined storage (SDS) system, storage hardware isseparated from software that manages the storage infrastructure. In SDS,the software managing a software-defined storage environment may alsoprovide policy management for features such as deduplication,replication, thin provisioning, snapshots and backup. By definition, SDSsoftware is separate from the hardware it is managing, and can beimplemented via appliances over a traditional Storage Area Network(SAN), or implemented as part of a scale-out Network-Attached Storage(NAS) solution, or as the basis of an Object-based storage solution.

The description above is presented as a general overview of related artin this field and should not be construed as an admission that any ofthe information it contains constitutes prior art against the presentpatent application.

SUMMARY

There is provided, in accordance with an embodiment of the presentinvention a method, including defining multiple storage capabilities fora set of storage resources, the storage resources including storagespace, defining a plurality of storage services, each of the storageservices including one or more of the storage capabilities for a subsetof the storage resources, configuring a software defined storage (SDS)system including the defined storage services, receiving, by the SDSsystem, a request to forecast an amount of the storage space includingone or more of the storage capabilities that will be available at aspecified future time, identifying one or more of the storage servicesincluding the one or more storage capabilities, and computing, for theidentified one or more storage services, a predicted amount of thestorage space at the specified future time.

There is also provided, in accordance with an embodiment of the presentinvention an apparatus, including multiple storage devices, and aprocessor configured to define multiple storage capabilities for a setof storage resources, the storage resources including storage space onthe storage devices, to define a plurality of storage services, each ofthe storage services including one or more of the storage capabilitiesfor a subset of the storage resources, to configure a software definedstorage (SDS) system including the defined storage services, to receive,by the SDS system, a request to forecast an amount of the storage spaceincluding one or more of the storage capabilities that will be availableat a specified future time, to identify one or more of the storageservices including the one or more storage capabilities, and to compute,for the identified one or more storage services, a predicted amount ofthe storage space at the specified future time.

There is further provided, in accordance with an embodiment of thepresent invention a computer program product, the computer programproduct including a non-transitory computer readable storage mediumhaving computer readable program code embodied therewith, the computerreadable program code including computer readable program codeconfigured to define multiple storage capabilities for a set of storageresources, the storage resources including storage space, computerreadable program code configured to define a plurality of storageservices, each of the storage services including one or more of thestorage capabilities for a subset of the storage resources, computerreadable program code configured to arrange a software defined storage(SDS) system including the defined storage services, computer readableprogram code configured to receive, by the SDS system, a request toforecast an amount of the storage space including one or more of thestorage capabilities that will be available at a specified future time,computer readable program code configured to identify one or more of thestorage services including the one or more storage capabilities, andcomputer readable program code configured to compute, for the identifiedone or more storage services, a predicted amount of the storage space atthe specified future time.

BRIEF DESCRIPTION OF THE DRAWINGS

The disclosure is herein described, by way of example only, withreference to the accompanying drawings, wherein:

FIG. 1 is a block diagram that schematically illustrates a storagesystem comprising a storage controller, in accordance with an embodimentof the present invention;

FIG. 2 is a block diagram that schematically illustrates configurationof multiple storage controllers configured as a software-defined storage(SDS) system, in accordance with an embodiment of the present invention;and

FIG. 3 is a flow diagram that schematically illustrates a method offorecasting, in the SDS system, available storage having one or morespecific storage capabilities, in accordance with an embodiment of thepreset invention.

DETAILED DESCRIPTION OF EMBODIMENTS

As usage of software defined storage (SDS) increases, storageadministrators find themselves dealing with many types of storagesystems, each holding a unique set of capabilities. For example, astorage administrator may needs to provision storage space with specificcapabilities that are defined either by a software application or byusers that will use the provisioned storage space. Therefore,efficiently monitoring and planning storage space allocation are crucialskills for storage administration.

Embodiments of the present invention enable systems implementing storageabstraction (e.g., a software defined storage system) to processrequests to forecast storage capacity. As described hereinbelow,multiple storage capabilities for a set of storage resources aredefined, the storage resources comprising storage space, and a pluralityof storage services are defined, each of the storage services comprisingone or more of the storage capabilities for a subset of the storageresources. A software defined storage (SDS) system comprising thedefined storage services is configured, and upon the SDS systemreceiving a request to predict an amount of the storage space comprisingone or more of the storage capabilities that will be available at aspecified future time, one or more of the storage services comprisingthe one or more storage capabilities are identified, and a predictedamount of the storage space is computed for the identified one or morestorage services.

FIG. 1 is a block diagram that schematically illustrates a dataprocessing storage subsystem 20, in accordance with an embodiment of theinvention. The particular subsystem (also referred to herein as astorage system) shown in FIG. 1 is presented to facilitate anexplanation of the invention. However, as the skilled artisan willappreciate, the invention can be practiced using other computingenvironments, such as other storage subsystems with diversearchitectures and capabilities.

Storage subsystem 20 receives, from one or more host computers 22,input/output (I/O) requests, which are commands to read or write data atlogical addresses on logical volumes. Any number of host computers 22are coupled to storage subsystem 20 by any means known in the art, forexample, using a network. Herein, by way of example, host computers 22and storage subsystem 20 are assumed to be coupled by a Storage AreaNetwork (SAN) 26 incorporating data connections 24 and Host Bus Adapters(HBAs) 28. The logical addresses specify a range of data blocks within alogical volume, each block herein being assumed by way of example tocontain 512 bytes. For example, a 10 KB data record used in a dataprocessing application on a given host computer 22 would require 20blocks, which the given host computer might specify as being stored at alogical address comprising blocks 1,000 through 1,019 of a logicalvolume. Storage subsystem 20 may operate in, or as, a SAN system.

Storage subsystem 20 comprises a clustered storage controller 34 coupledbetween SAN 26 and a private network 46 using data connections 30 and44, respectively, and incorporating adapters 32 and 42, againrespectively. In some configurations, adapters 32 and 42 may comprisehost bus adapters (HBAs). Clustered storage controller 34 implementsclusters of storage modules 36, each of which includes a processor 52,an interface 40 (in communication between adapters 32 and 42), and acache 38. Each storage module 36 is responsible for a number of storagedevices 50 by way of a data connection 48 as shown.

As described previously, each storage module 36 further comprises agiven cache 38. However, it will be appreciated that the number ofcaches 38 used in storage subsystem 20 and in conjunction with clusteredstorage controller 34 may be any convenient number. While all caches 38in storage subsystem 20 may operate in substantially the same manner andcomprise substantially similar elements, this is not a requirement. Eachof the caches 38 may be approximately equal in size and is assumed to becoupled, by way of example, in a one-to-one correspondence with a set ofphysical storage devices 50, which may comprise disks. In oneembodiment, physical storage devices may comprise such disks. Thoseskilled in the art will be able to adapt the description herein tocaches of different sizes.

Each set of storage devices 50 comprises multiple slow and/or fastaccess time mass storage devices, herein below assumed to be multiplehard disks. FIG. 1 shows caches 38 coupled to respective sets of storagedevices 50. In some configurations, the sets of storage devices 50comprise one or more hard disks, or solid state drives (SSDs) which canhave different performance characteristics. In response to an I/Ocommand, a given cache 38, by way of example, may read or write data ataddressable physical locations of a given storage device 50. In theembodiment shown in FIG. 1, caches 38 are able to exercise certaincontrol functions over storage devices 50. These control functions mayalternatively be realized by hardware devices such as disk controllers(not shown), which are linked to caches 38.

Each storage module 36 is operative to monitor its state, including thestates of associated caches 38, and to transmit configurationinformation to other components of storage subsystem 20 for example,configuration changes that result in blocking intervals, or limit therate at which I/O requests for the sets of physical storage areaccepted.

Routing of commands and data from HBAs 28 to clustered storagecontroller 34 and to each cache 38 may be performed over a networkand/or a switch. Herein, by way of example, HBAs 28 may be coupled tostorage modules 36 by at least one switch (not shown) of SAN 26, whichcan be of any known type having a digital cross-connect function.Additionally or alternatively, HBAs 28 may be coupled to storage modules36.

In some embodiments, data having contiguous logical addresses can bedistributed among modules 36, and within the storage devices in each ofthe modules. Alternatively, the data can be distributed using otheralgorithms, e.g., byte or block interleaving. In general, this increasesbandwidth, for instance, by allowing a volume in a SAN or a file innetwork attached storage to be read from or written to more than onegiven storage device 50 at a time. However, this technique requirescoordination among the various storage devices, and in practice mayrequire complex provisions for any failure of the storage devices, and astrategy for dealing with error checking information, e.g., a techniquefor storing parity information relating to distributed data. Indeed,when logical unit partitions are distributed in sufficiently smallgranularity, data associated with a single logical unit may span all ofthe storage devices 50.

While such hardware is not explicitly shown for purposes of illustrativesimplicity, clustered storage controller 34 may be adapted forimplementation in conjunction with certain hardware, such as a rackmount system, a midplane, and/or a backplane. Indeed, private network 46in one embodiment may be implemented using a backplane. Additionalhardware such as the aforementioned switches, processors, controllers,memory devices, and the like may also be incorporated into clusteredstorage controller 34 and elsewhere within storage subsystem 20, againas the skilled artisan will appreciate. Further, a variety of softwarecomponents, operating systems, firmware, and the like may be integratedinto one storage subsystem 20.

Storage devices 50 may comprise a combination of high capacity hard diskdrives and solid state disk drives. In some embodiments each of storagedevices 50 may comprise a logical storage device. In storage systemsimplementing the Small Computer System Interface (SCSI) protocol, thelogical storage devices may be referred to as logical units, or LUNs.While each LUN can be addressed as a single logical unit, the LUN maycomprise a combination of high capacity hard disk drives and/or solidstate disk drives.

While the configuration in FIG. 1 shows storage controller 34 comprisingfour modules 36 and each of the modules coupled to four storage devices50, a given storage controller comprising any multiple of modules 36coupled to any plurality of storage devices 50 is considered to be withthe spirit and scope of the present invention.

FIG. 2 is a block diagram that schematically illustrates a SDS system 60comprising multiple storage controllers 34, in accordance with anembodiment of the present invention. While FIG. 2 shows SDS system 60comprising multiple clustered storage controllers 34, configuring theSDS system using any type of storage systems is considered to be withinthe spirit and scope of the present invention.

Each module 36 stores cache 38 and interface 40 in a memory 62. In oneor more of modules 36, memory 62 stores an SDS management application64, a set of storage capabilities 66 and a set of storage services 68.Processor 52 executes SDS management application 64 that uses storageresources in storage controllers 34 to configure and manage SDS system60. In embodiments where SDS management application 64 executes in morethan one module 36, the SDS management application can be configured asa distributed software application to manage SDS system 60.

In some embodiments, SDS system 60 managed by SDS management application64 comprises storage resources in one or more modules 36 in one or morestorage controllers 34 including a given module 36 comprising the SDSmanagement application. In alternative embodiments, SDS system 60comprises one or more modules 36 in one or more storage controllers 34wherein none of the modules having the storage resources used by SDSsystem 60 include the SDS management application that manages the SDSsystem.

In embodiments of the present invention, the storage resources comprisephysical and logical resources in storage controllers 34 such as storagespace, processor resources such as processor utilization and networkingresources such as network throughput. For example, storage devices 50may comprise a mix of solid state disk drives (SSDs), higher capacity“slower” hard disk drives and lower capacity “faster disk drives, andthe storage space may be allocated as blocks of storage space (e.g., 100MB) on each type of the storage devise.

Storage capabilities 66 comprise various methods that storage servicesthat SDS system 60 can offer for storing data such as encryption,compression and thin provisioned storage pools. In some embodiments,different types/levels of compression and different types/levels ofencryption may be stored as separate storage capabilities 66.

Storage services 68 comprise blocks of storage resources configured withone or more storage capabilities. For example, a first given storageservice 58 may comprise 128 MB of compressed storage space on an SSD,and a second given storage service 58 may comprise 500 GB of encryptedstorage space on a hard drive that is configured as a thin pool.

In some embodiments, the storage resource may comprise logical volumes70. In the configuration shown in FIG. 2, storage devices 50 comprisestorage space that processor 52 can partition into logical volumes 70.Each logical volume can be stored on a single storage device 50 or canbe distributed among multiple storage devices 50 in one or more storagecontrollers 34. Therefore a given storage service 68 may be distributedover multiple storage devices 50 and/or multiple storage controllers 34.

One or more storage controllers 34 may be coupled to a data terminal 72comprising a keyboard 74 and a display 76.

Processors 52 comprise general-purpose central processing units (CPU) orspecial-purpose embedded processors, which are programmed in software orfirmware to carry out the functions described herein. The software maybe downloaded to modules 36 in electronic form, over a network, forexample, or it may be provided on non-transitory tangible media, such asoptical, magnetic or electronic memory media. Alternatively, some or allof the functions of processors 52 may be carried out by dedicated orprogrammable digital hardware components, or using a combination ofhardware and software elements.

The present invention may be a system, a method, and/or a computerprogram product. The computer program product may include a computerreadable storage medium (or media) having computer readable programinstructions thereon for causing a processor to carry out aspects of thepresent invention.

The computer readable storage medium can be a tangible device that canretain and store instructions for use by an instruction executiondevice. The computer readable storage medium may be, for example, but isnot limited to, an electronic storage device, a magnetic storage device,an optical storage device, an electromagnetic storage device, asemiconductor storage device, or any suitable combination of theforegoing. A non-exhaustive list of more specific examples of thecomputer readable storage medium includes the following: a portablecomputer diskette, a hard disk, a random access memory (RAM), aread-only memory (ROM), an erasable programmable read-only memory (EPROMor Flash memory), a static random access memory (SRAM), a portablecompact disc read-only memory (CD-ROM), a digital versatile disk (DVD),a memory stick, a floppy disk, a mechanically encoded device such aspunch-cards or raised structures in a groove having instructionsrecorded thereon, and any suitable combination of the foregoing. Acomputer readable storage medium, as used herein, is not to be construedas being transitory signals per se, such as radio waves or other freelypropagating electromagnetic waves, electromagnetic waves propagatingthrough a waveguide or other transmission media (e.g., light pulsespassing through a fiber-optic cable), or electrical signals transmittedthrough a wire.

Computer readable program instructions described herein can bedownloaded to respective computing/processing devices from a computerreadable storage medium or to an external computer or external storagedevice via a network, for example, the Internet, a local area network, awide area network and/or a wireless network. The network may comprisecopper transmission cables, optical transmission fibers, wirelesstransmission, routers, firewalls, switches, gateway computers and/oredge servers. A network adapter card or network interface in eachcomputing/processing device receives computer readable programinstructions from the network and forwards the computer readable programinstructions for storage in a computer readable storage medium withinthe respective computing/processing device.

Computer readable program instructions for carrying out operations ofthe present invention may be assembler instructions,instruction-set-architecture (ISA) instructions, machine instructions,machine dependent instructions, microcode, firmware instructions,state-setting data, or either source code or object code written in anycombination of one or more programming languages, including an objectoriented programming language such as Smalltalk, C++ or the like, andconventional procedural programming languages, such as the “C”programming language or similar programming languages. The computerreadable program instructions may execute entirely on the user'scomputer, partly on the user's computer, as a stand-alone softwarepackage, partly on the user's computer and partly on a remote computeror entirely on the remote computer or server. In the latter scenario,the remote computer may be connected to the user's computer through anytype of network, including a local area network (LAN) or a wide areanetwork (WAN), or the connection may be made to an external computer(for example, through the Internet using an Internet Service Provider).In some embodiments, electronic circuitry including, for example,programmable logic circuitry, field-programmable gate arrays (FPGA), orprogrammable logic arrays (PLA) may execute the computer readableprogram instructions by utilizing state information of the computerreadable program instructions to personalize the electronic circuitry,in order to perform aspects of the present invention.

Aspects of the present invention are described herein with reference toflowchart illustrations and/or block diagrams of methods, apparatus(systems), and computer program products according to embodiments of theinvention. It will be understood that each block of the flowchartillustrations and/or block diagrams, and combinations of blocks in theflowchart illustrations and/or block diagrams, can be implemented bycomputer readable program instructions.

These computer readable program instructions may be provided to aprocessor of a general purpose computer, special purpose computer, orother programmable data processing apparatus to produce a machine, suchthat the instructions, which execute via the processor of the computeror other programmable data processing apparatus, create means forimplementing the functions/acts specified in the flowchart and/or blockdiagram block or blocks.

These computer readable program instructions may also be stored in acomputer readable storage medium that can direct a computer, aprogrammable data processing apparatus, and/or other devices to functionin a particular manner, such that the computer readable storage mediumhaving instructions stored therein comprises an article of manufactureincluding instructions which implement aspects of the function/actspecified in the flowchart and/or block diagram block or blocks.

The computer readable program instructions may also be loaded onto acomputer, other programmable data processing apparatus, or other deviceto cause a series of operational steps to be performed on the computer,other programmable apparatus or other device to produce a computerimplemented process, such that the instructions which execute on thecomputer, other programmable apparatus, or other device implement thefunctions/acts specified in the flowchart and/or block diagram block orblocks.

Storage Capacity Forecasting

FIG. 3 is a flow diagram that schematically illustrates a method offorecasting storage capacity (i.e., storage space) by a set of one ormore storage capabilities 66 in SDS system 60, in accordance with anembodiment of the present invention. In a first identification step 80,SDS management application 64 identifies a set of storage resources instorage controllers 34, and in a first definition step 82, the SDSmanagement application defines multiple storage capabilities 66 for theidentified storage resources.

In a second definition step 84, SDS management application 64 defines aplurality of software services 68 that comprise the identified storageresources and the defined storage capabilities 66, and in aconfiguration step 86, the SDS management application configures SDSsystem 60 comprising the defined software services. The storageresources, the storage capabilities and the storage services aredescribed supra in the description referencing FIG. 2.

In a receive step 88, SDS management application 64 receives, from auser, a request to forecast, at a specified time in the future, anavailability of storage space in SDS system 60 comprising one or morestorage capabilities 66. For example, a system administrator may want aforecast for the amount of thinly provisioned compressed storage spacethat will be available in six months.

In a second identification step 90, SDS management application 64identifies one or more storage services 68 that comprise the requestedstorage capabilities. In some embodiments, a given identified storageservices 68 may comprise one or more additional storage capabilities 66not included in the request. For example, the request may be to forecastcompressed storage space, and the given storage service 68 may comprisestorage space that is compressed and encrypted.

In a computation step 92, SDS management application 64 computes, forthe identified one or more storage service, a prediction for the amountof the storage space that will be available at the specified time. Asdescribed hereinbelow, SDS management application 64 may use ahistorical availability analysis to compute the prediction. In someembodiments, the historical analysis may comprise trend, seasonality andcycle analyses.

Finally, in a convey step 94, SDS management application 64 conveys thecomputed prediction to the user, and the method ends. In the embodimentsdescribed in the flow diagram, the request comprise a request for aforecast (i.e., at a specified future time) of an availability storageresources associated with a given storage service 68. In a secondembodiment, as described hereinbelow, the request (i.e., in step 88) maycomprise alert request, and SDS management application 64 can beconfigured to convey an alert upon detecting that the available storagespace in the one or more identified services falls below an amountspecified in the request.

For example, a storage administrator may need to know that storagecapacity for a given storage capability 66 or if a set of the storagecapabilities is expected hit a defined minimum limit in the near future,even when additional storage space in SDS system 60 may still beavailable. Since several storage systems (e.g., storage controllers 34)may share some qualities and differ in others, the storage administratorneeds to be able and define a set of storage capabilities 66 for whichthe storage systems that fulfill these capabilities will be monitored asa unit, with a capacity forecaster that enables alerts to be raised asneeded. As there may be several sets of storage capabilities 66, systemsimplementing embodiments of the present invention can provide a simpleand automatic way to define monitoring and forecast for storage systemsfulfilling a dynamic set of required storage capabilities 66.

Given an existing forecasting method that may be applied to full storagesystems, SDS management application 64 can use a filtering mechanismbased on storage capabilities 66 in order to forecast aggregated storageusage based on the storage systems that satisfy the given set ofrequirements. This can also apply to a more basic mechanism which alertsthe storage administrator when the storage space goes below a certainthreshold, aggregating all storage space holding a given set of storagecapabilities 66.

For example, SDS management application 64 can take a forecasting methodF(S) that, given a storage system S or an aggregated system comprised ofseveral storage systems, and its historical data, can forecast futurestorage usage. F′(S, C) can be defined so that given a set of storagesystems S and a set of required storage system capabilities C, F′(S, C)can forecast storage usage of the storage space that fulfillscapabilities C, using the following algorithm:

F′ (S,C) : S′ = empty storage system set. For each storage system s inS: If (for each capability c in C, s fulfills c): S′ = S′ + s result =F(S′)

In embodiments of the present invention, the result of forecastingmethod F′ may be used in the same manner that F is used.

The flowchart(s) and block diagrams in the Figures illustrate thearchitecture, functionality, and operation of possible implementationsof systems, methods and computer program products according to variousembodiments of the present invention. In this regard, each block in theflowchart or block diagrams may represent a module, segment, or portionof code, which comprises one or more executable instructions forimplementing the specified logical function(s). It should also be notedthat, in some alternative implementations, the functions noted in theblock may occur out of the order noted in the figures. For example, twoblocks shown in succession may, in fact, be executed substantiallyconcurrently, or the blocks may sometimes be executed in the reverseorder, depending upon the functionality involved. It will also be notedthat each block of the block diagrams and/or flowchart illustration, andcombinations of blocks in the block diagrams and/or flowchartillustration, can be implemented by special purpose hardware-basedsystems that perform the specified functions or acts, or combinations ofspecial purpose hardware and computer instructions.

It will be appreciated that the embodiments described above are cited byway of example, and that the present invention is not limited to whathas been particularly shown and described hereinabove. Rather, the scopeof the present invention includes both combinations and subcombinationsof the various features described hereinabove, as well as variations andmodifications thereof which would occur to persons skilled in the artupon reading the foregoing description and which are not disclosed inthe prior art.

1. A method, comprising: defining multiple storage capabilities for aset of storage resources, the storage resources comprising storagespace; defining a plurality of storage services, each of the storageservices comprising one or more of the storage capabilities for a subsetof the storage resources; configuring a software defined storage (SDS)system comprising the defined storage services; receiving, by the SDSsystem, a request to forecast an amount of the storage space comprisingone or more of the storage capabilities that will be available at aspecified future time; identifying one or more of the storage servicescomprising the one or more storage capabilities; and computing, for theidentified one or more storage services, a predicted amount of thestorage space at the specified future time.
 2. The method according toclaim 1, wherein each of the storage capabilities is selected from agroup consisting of a compression capability, an encryption capabilityand a thin provisioning capability.
 3. The method according to claim 1,wherein the storage resources comprise additional resources selectedfrom a group consisting of processing resources and networkingresources.
 4. The method according to claim 1, wherein computing theprediction comprises computing a historical availability analysis forthe storage space in the one or more identified services.
 5. The methodaccording to claim 1, wherein the request comprises an alert request,and comprising conveying an alert upon detecting that the availablestorage space in the one or more identified services falls below anamount specified in the request.
 6. The method according to claim 1,wherein the storage space for a given storage resource is distributedamong multiple physical storage devices.
 7. The method according toclaim 1, wherein a given identified given storage service comprises oneor more additional storage capabilities not required by the request. 8.An apparatus, comprising: multiple storage devices; and a processorconfigured: to define multiple storage capabilities for a set of storageresources, the storage resources comprising storage space on the storagedevices, to define a plurality of storage services, each of the storageservices comprising one or more of the storage capabilities for a subsetof the storage resources, to configure a software defined storage (SDS)system comprising the defined storage services, to receive, by the SDSsystem, a request to forecast an amount of the storage space comprisingone or more of the storage capabilities that will be available at aspecified future time, to identify one or more of the storage servicescomprising the one or more storage capabilities, and to compute, for theidentified one or more storage services, a predicted amount of thestorage space at the specified future time.
 9. The apparatus accordingto claim 8, wherein each of the storage capabilities is selected from agroup consisting of a compression capability, an encryption capabilityand a thin provisioning capability.
 10. The apparatus according to claim8, wherein the storage resources comprise additional resources selectedfrom a group consisting of processing resources and networkingresources.
 11. The apparatus according to claim 8, wherein the processoris configured to compute the prediction by computing a historicalavailability analysis for the storage space in the one or moreidentified services.
 12. The apparatus according to claim 8 wherein therequest comprises an alert request, and wherein the processor isconfigured to convey an alert upon detecting that the available storagespace in the one or more identified services falls below an amountspecified in the request.
 13. The apparatus according to claim 8,wherein the storage space for a given storage resource is distributedamong multiple physical storage devices.
 14. The apparatus according toclaim 8, wherein a given identified given storage service comprises oneor more additional storage capabilities not required by the request. 15.A computer program product, the computer program product comprising: anon-transitory computer readable storage medium having computer readableprogram code embodied therewith, the computer readable program codecomprising: computer readable program code configured to define multiplestorage capabilities for a set of storage resources, the storageresources comprising storage space; computer readable program codeconfigured to define a plurality of storage services, each of thestorage services comprising one or more of the storage capabilities fora subset of the storage resources; computer readable program codeconfigured to arrange a software defined storage (SDS) system comprisingthe defined storage services; computer readable program code configuredto receive, by the SDS system, a request to forecast an amount of thestorage space comprising one or more of the storage capabilities thatwill be available at a specified future time; computer readable programcode configured to identify one or more of the storage servicescomprising the one or more storage capabilities; and computer readableprogram code configured to compute, for the identified one or morestorage services, a predicted amount of the storage space at thespecified future time.
 16. The computer program product according toclaim 15, wherein each of the storage capabilities is selected from agroup consisting of a compression capability, an encryption capabilityand a thin provisioning capability, and wherein the storage resourcescomprise additional resources selected from a group consisting ofprocessing resources and networking resources.
 17. The computer programproduct according to claim 15, wherein the computer readable programcode is configured to compute the prediction by computing a historicalavailability analysis for the storage space in the one or moreidentified services.
 18. The computer program product according to claim15, wherein the request comprises an alert request, and comprisingcomputer readable program code configured to convey an alert upondetecting that the available storage space in the one or more identifiedservices falls below an amount specified in the request.
 19. Thecomputer program product according to claim 15, wherein the storagespace for a given storage resource is distributed among multiplephysical storage devices.
 20. The computer program product according toclaim 15, wherein a given identified given storage service comprises oneor more additional storage capabilities not required by the request.